It's a second-round pick. It's not like they traded a #1 pick in the draft. I honestly could not care less about a second-round pick. If a second-round pick is the price to get rid of a sizable contract that has to be moved in order to sign a player to a position of need, I won't even think about it for a second.
Worrying about a second-round pick or the third-best small forward being traded for cap space is incredibly short-sighted, in my opinion. Suns are loaded with youngsters- Booker, Oubre, Bridges, Ayton, and then Melton, Okobo, Jackson, and another two rookies. They don't need a second-round pick. They need players who can play basketball. If they were to not sign a veteran point guard, then your concerns are spot on, and I will be right there with you. However, at this time, we don't know how it will play out. We have incomplete information right now, and there is no way to tell if it was a great move or a terrible one.